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对不同化学成分的铁基烧结零件材料进行离子氮碳共渗处理 ,观察工艺参数和合金元素对共渗层相组成、渗层深度、硬度的影响。试验结果表明 :共渗温度、时间、气氛等工艺参数以及在Fe C烧结材料中添加Mo、Cu等合金元素 ,明显影响渗层深度和表面硬度。对铁基烧结零件材料进行离子氮碳共渗处理 ,当保温时间为 2～ 3h ,C3H6O(丙酮 )输入量为保护气氛总体积的 7% (体积分数 ,下同 )时 :材料密度为 6 7g/cm3 的Fe C材料 ,在 5 6 0～ 6 2 0℃ ,可获得 5 30～ 770HV0 1的表面硬度 ,渗层深度为 0 15～ 0 6 5mm ,其中化合物层厚度为 12～ 2 3μm ;Fe C Cu材料 ,在 5 6 0～ 5 80℃ ,可获得 6 40～ 6 5 0HV0 1的表面硬度 ,渗层深度为 0 2 3～0 38mm ,其中化合物层厚度为 8～ 12 μm ;Fe C Cu Mo材料 ,在 5 6 0～ 5 80℃ ,可获得 76 0～ 880HV0 1的表面硬度 ,渗层深度为 0 17～ 0 2 5mm ,其中化合物层厚度为 8～ 17μm
The nitrocarburizing of Fe-based sintered parts with different chemical compositions was performed. The effects of technological parameters and alloying elements on the phase composition, the depth and the hardness of the infiltrated layer were observed. The experimental results show that the parameters of co-infiltration temperature, time and atmosphere, as well as the addition of alloying elements such as Mo and Cu to Fe C sintering material, obviously affect the depth of infiltration layer and surface hardness. When the holding time is 2 ~ 3h and the input amount of C3H6O (acetone) is 7% of the total volume of the protective atmosphere (volume fraction), the material density is 6 7g / cm3 of Fe C material, the surface hardness of 5 30-770 HV0 1 is obtained at a temperature of 5-6 0-620 ° C., the depth of the diffusion layer is 0-15-0 0.6 mm, and the thickness of the compound layer is 12-2 3 μm. Fe C Cu material, the surface hardness of 6 40-6 500HV0 1 is obtained at a temperature of 5-6 0-580 ° C. The depth of the diffusion layer is 0 2 3-0 38 mm, and the thickness of the compound layer is 8-12 μm. Fe C Cu Mo material, the surface hardness of 76 0-880 HV0 1 can be obtained at a temperature of 5-6 0-580 ° C. The depth of the diffusion layer is 0 17-0 25 mm, and the thickness of the compound layer is 8-17 μm